Current excitation model for Cerenkov lasers with a planar waveguide
Current excitation model for Cerenkov lasers with a planar waveguide
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平面波导切伦科夫激光器的电流激励模型
DOI：
10.1143/jjap.49.096402
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Yamada,M. and Kuwamura,Y
中科院分区：
文献类型：
--
作者：
Fares,H.;Yamada,M. and Kuwamura,Y
本文对平面介质波导切伦科夫自由电子激光器的自发辐射和受激辐射进行了统一的理论分析。电磁波的激发用电子束的电流源来表示。一个相对论经典分析应用到这个模型中，电子被表示为一个空间局域化的点粒子。自发辐射是通过与电子运动相关的空间变化场分量来计算的，受激辐射是基于电磁场对电子速度和密度的调制而导出的。由受激辐射引起的相互作用机制随时间的变化分为过渡态和稳态。引入电子弛豫效应来解释稳态下的工作。该分析与已知分析的兼容性也得到了证实。
A unified theoretical analysis of the spontaneous and stimulated emissions in Cerenkov free-electron lasers (CFELs) with a planar dielectric waveguide is shown. The excitation of the electromagnetic (EM) wave is formulated with current sources of the electron beam. A relativistic classical analysis is applied to this model, where the electron is represented as a spatially localized point particle. The spontaneous emission is evaluated through spatially varying field components associated with the motion of an electron. The stimulated emission is derived on the basis of the modulations of electron velocity and density by the EM field. Interaction regimes induced by the stimulated emission are classified into transition and steady states with the time variation. The effect of electron relaxation is introduced to explain the operation in the steady state. The compatibility of this analysis with already known analyses is also confirmed.